1)
What is "Ma'ale ha'Luchis"?
1.
Rashi: It is the mountain called Luchis. Radak - because it is elevated, they [ascended, and] hoped to be protected there.
2)
Why is it written ha'Lachos, and we pronounce it ha'Luchis?
1.
Radak: Vov and Yud are interchangeable.
3)
Why is there a double expression "bi'Vchi Ya'aleh Bechi"?
1.
Radak: This is to strengthen the matter.
4)
What is the meaning of "Tzarei Tza'akas Shever Shame'u"?
1.
Radak: Their afflicters heard their screams over their breakage. Tzarei is like Tzarim (even though it is not Samuch). Also "Chalonei Shekufim Atumim" (Melachim I, 6:4) is like Chalonim, and many similar verses.